US2874131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anion-exchange resins containing sulfonium groups and processes for making them
Assignee: Rohm and Haas Co
•
Filing: 1956-04-13
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Granted: 1959-02-17
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Expires: 1976-04-13
Abstract
No abstract record available.
Inventors
- 👤 Jesse C H Hwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:45
CPC Classifications
B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/14; C; C08; C08F; C08F8/00; C08F8/44; C08F2800/00; C08F2800/20; C08F2810/00; C08F2810/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
THE -S-ALKYLATED COPOLYMER FORMED FROM ABOUT 7-10 MOLAR PERCENT OF A CROSSLINKING AGENT CONTAINING AT LEAST TWO NON-CONJUGATED POINTS OF ETHYLENIC UNSATURATION AND ABOUT 90-93 MOLAR PERCENT OF VINYL SULFIED, SAID COPOLYMER HAVING ABOUT 9-44 MOLAR PERCENT OF ITS
Claim 2
Dependent Claim
39 words
THE -S-ALKYLATED COPOLYMER FORMED FROM ABOUT 7-10 MOLAR PERCENT OF A CROSSLINKING AGENT CONTAINING AT LEAST TWO NON-CONJUGATED POINTS OF ETHYLENIC UNSATURATION AND ABOUT 90-93 MOLAR PERCENT OF VINYL SULFIED, SAID COPOLYMER HAVING ABOUT 9-44 MOLAR PERCENT OF ITS
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-16 | 1962-08-18 | 1963-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-16 | 1966-08-18 | 1967-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-16 | 1970-08-18 | 1971-02-17 | $7700.00 | Window Closed / Lapsed |